盐酸介质中邻苯二胺双缩肉桂醛对A3碳钢的缓蚀行为研究

Inhibition behavior of N,N'-dicinnamylidene-o-phenylenediamine for mild steel in hydrochloric acid

以邻苯二胺和肉桂醛为原料合成了一种新型Schiff碱缓蚀剂(DCPD)。采用失重法,电化学阻抗和极化曲线法考察了在10%盐酸介质中该缓蚀剂对A3钢的缓蚀行为。失重法结果表明,DCPD对盐酸中的A3碳钢具有良好的缓蚀作用。电化学阻抗测试结果表明,与空白酸液相比,当DCPD浓度在0.03125~0.1875 mmol·L^(-1)范围内时,电极的弥散效应增强,腐蚀反应速率主要由活化焓控制;当DCPD浓度达到0.25 mmol·L^(-1)时,电极的弥散效应减弱,腐蚀反应速率主要由活化熵控制。

A new schiff base N ,N＇- dicinnamylidene- o-phenylenediamine as acid inhibitor was synthesized by the condensation of o- phenylenediamine and cinnamaldehyde. The corrosion inhibitive performance of the inhibitor for A3 steel in HCl solution was inves-tigated by weight loss test and potentiodynamic polarization and electrochemical impedance spectroscopy （ EIS） . The results of weight loss showed that DCPD could effectively inhibit the corrosion to carbon steel in 10% HCl solution. The results of EIS indica-ted, compared with blank acid,dispersive effct decreaseed and corrosion rate was controlled by active enthalpy when DCPD concen-tration was in the range of 0. 03125 mmol · L^-1-0. 1875 mmol · L^-1 ;while dispersive effct was increased and corrosion rate was controlled by active entropy with 0. 25 mmol · L^-1 DCPD.